Drop hammer



A. T. MURRAY DROP HAMMER May 13, 1941.

Original Filed Aug. 21, 1939 INVENTOR 145mm ZMURRAY ATT NEYS PatentedMay 13, 1941 UNETEB STATE ?ATET Q i i i Q E Moore Drop Forging Company,Springfield, Mass, a corporation of Massachusetts 1 Original applicationAugust 21, 1939, Serial No. 291,151. Divided and this application July20,

1940, Serial No. 346,644

3 Claims.

This invention relates to drop hammers, and has particular reference toimprovements therein in the matter of lengthening the life of themachine parts and facilitating and improving the accuracy of theadjustment of the registration between the hammer and the anvil.

In accordance with the invention the anvil is provided with a pair ofvertical guides, each adjustable in two directions at right angles toeach other. The hammer operatin mechanism is carried in a frame having amassive foundation entirely separate from that of the anvil. By havingthe guides carried solely by the anvil they function to guide the hammervertically into exact registration without reference to any strains thatmay be imposed upon the hammer actuating mechanism. Conversely, thecolumns supporting the super-structure which carries the hammeroperating mechanism are free from all vibrations resulting from theimpact of the hammer on the anvil, and the crystallization of the metalin these columns, which has hitherto been a serious cause of fracture,is avoided.

The manner in which these objects are accomplished will be understoodbest by references to the accompanying drawing, in which:

Fig. 1 is an elevation, partly broken away, of a drop hammer constructedin accordance with my invention; and

Fig. 2 is a side view of the hammer shown in Fig. 1, partly broken awayin median'section.

This application is a division of my application filed August 21, 1939,Serial No. 291,151.

The hammer It] may be carried by a strap or board II which is operatedby suitable mechanism 9 contained in a super-structure l2. The mechanismmay be of any desired type, and it is not necessary to illustrate ithere. The superstructure is carried upon vertical frames or 001- umns 13supported in foundations I4 preferably extending a substantial distancebelow the ground level l5. These foundations are entirely separate froman intermediate foundation l6 which supports the anvil ll. By making thefoundations individually massive and separate one from another,transmission of vibration between them will be greatly reducedfrom thatwhich would occur were the foundations to be formed in one piece. Thecolumns I3 are thus free from the vibrations set up by the shock causedby the hammer striking the anvil. In prior installations, in which thecolumns I3 arose directly from the anvil, the transmission of vibrationsthrough the column from the anvil to the super-structure and back againby reflection has been a serious cause of strain on the columns, leadingto crystallization and final fracture. By havin the anvil and thecolumns each terminating in a separate massive foundation, the free flowof vibrations between them is broken up.

In Fig. 2 is shown a detail of the hammer structure which is ofconsiderable value in permitting adjustment of the hammer blow fordifferent types of work and in compensating for the loss of metaloccasioned by the necessity of trimming down the hammer after extendeduse in order to keep its surface in shape. The board II is secured to awrist pin 60 turning freely on a pintle 6| which itself may turn in abushing 62 in a hole extending laterally through the hammer. A taperedhole 63 is formed vertically in the upper part of the hammer, preferablytraversing the bushing 62. Fitting within each vertical hole 63 is theshank 64 of a heavy weight 65. When the weight is in position it forms astop for the ends of the pintle 6|, so that no extra mechanism need beemployed to keep the pintle in position.

A threaded hole 66 is provided in the hammer below the shanks 64 so thatby inserting a threaded rod in each hole 66 the weights may be forcedout of wedging contact with the tapered hole. It will be understood thatthe weights may be replaced as desired for the adjustment of the weightof the hammer either for particular classes of work or to compensate forWear. When once placed in position the weights wedge themselves firmlyin place on the first blow of the hammer and cannot work themselvesloose.

I claim:

1. In a drop hammer, a hammer having tapered holes having greaterdiameters at their top than at their bottom, weights having shankstapered to fit in said holes, and threaded holes aligned with saidtapered holes.

2. In a drop hammer, a hammer construction comprising a plurality ofremovable weights having tapered shanks fitting within tapered recessesin the hammer, the hammer and weights being so shaped one relative tothe other as to permit a force to be applied between them in a directionto cause loosening of the tapered shank of the weight from its taperedsocket, the direction of the taper of the shank and socket being such asto cause the weight to become wedged in place upon the striking of theanvil by the hammer.

3. In a drop hammer, a hammer formed with taper-ed holes of a greaterdiameter at their upper ends than at their lower ends, and weightshaving shanks tapered to fit said holes whereby the effective weight ofthe hammer may be changed by replacing said weights.

ARTHUR T. MURRAY.

